Large well know slide rule that was made in Germany by A.W. Faber & Castell and is called the Novo Duplex 2/83, the one before the 2/83N. This one comes with box, instructions in German. Both slide rule and slider are in good condition with some signs of age and a little yellowing. The box is complete and in working condition, no cracks. It measures ca. 33 cm or 13 inches long to the 38 cm or 15 inches of the 2/83N. This great rule is reinforced with metal pieces on the ends. It has 27 scales to the 2/83N having 31. Check the attached video on how to work your vintage man tool : slide rule operation instructions!
